System is loaded, the boot loader transfers control to it and is Hardware and will then load the operating system. The boot loader will often perform some core initialization of the system Loader load a bigger boot loader, is called chain loading. This multi-stage boot loader, having a boot To load diagnostic software, or enabling diagnostic modes in the Giving the user a choice of operating systems to boot, the ability Would have error checking, among possibly other features, such as Loader would load another boot loader, called a second stage Since this initial program had to be as small as possible, it would That would have basic intelligence to read, say, the first sector In later systems, read-only memory would contain a small bootloader This program might do something basic such as read successiveīytes into memory from a paper tape attached to a teletype. Program, programming each memory location and then starting the The computer’s front panel to toggle in the code to load in a bigger In early minicomputer and microcomputer systems systems,Ī computer operator would use the switches on Wires with cuts in the appropirate places where a 0-bit was needed). Non-volatile memory (in early computers, this would be a grid of
MICROCOMPUTERS 1 HOP MODULE SOFTWARE
In some cases, the boot loader software would be hard wired as Panel would define the source of the data and the target memory address. Press a button to load a sequence of bytes from punched cards, Hence,Ĭomputers would have hardware that would enable the operator to When you turn on a computer, its memory is usually uninitialized. The operating system is loaded through a bootstrapping process, more How does this “first” program get to run? PDP–11/70 front panel However, it is usually storedĪs a file (or, more commonly, a collection of files) on a disk. One that allows you to run other programs. Booting an Operating System How do you run that first program?Īn operating sytem is sometimes described as “the first program,”
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